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Merge pull request #729 from F43nd1r/lastactivities
Finish all activities in stack instead of only last one
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135 changes: 135 additions & 0 deletions
135
acra-javacore/src/main/java/org/acra/collections/WeakStack.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| /* | ||
| * Copyright (c) 2019 | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| package org.acra.collections; | ||
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| import android.support.annotation.NonNull; | ||
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| import java.lang.ref.WeakReference; | ||
| import java.util.*; | ||
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| /** | ||
| * A stack which keeps only weak references | ||
| * | ||
| * @author F43nd1r | ||
| * @since 5.3.0 | ||
| */ | ||
| public class WeakStack<T> extends AbstractCollection<T> { | ||
| private final List<WeakReference<T>> contents = new ArrayList<>(); | ||
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| private void cleanup() { | ||
| for (WeakReference<T> weakReference : contents) { | ||
| if (weakReference.get() == null) contents.remove(weakReference); | ||
| } | ||
| } | ||
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| @Override | ||
| public int size() { | ||
| cleanup(); | ||
| return contents.size(); | ||
| } | ||
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| @Override | ||
| public boolean contains(Object o) { | ||
| if (o != null) { | ||
| for (WeakReference<T> weakReference : contents) { | ||
| if (o.equals(weakReference.get())) return true; | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
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| @NonNull | ||
| @Override | ||
| public Iterator<T> iterator() { | ||
| return new WeakIterator<>(contents.iterator()); | ||
| } | ||
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| @Override | ||
| public boolean add(T t) { | ||
| return contents.add(new WeakReference<T>(t)); | ||
| } | ||
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| @Override | ||
| public boolean remove(Object o) { | ||
| if (o != null) { | ||
| for (int i = 0; i < contents.size(); i++) { | ||
| if (o.equals(contents.get(i).get())) { | ||
| contents.remove(i); | ||
| return true; | ||
| } | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
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| public T peek() { | ||
| for (int i = contents.size() - 1; i >= 0; i--) { | ||
| T result = contents.get(i).get(); | ||
| if (result != null) return result; | ||
| } | ||
| throw new EmptyStackException(); | ||
| } | ||
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| public T pop() { | ||
| T result = peek(); | ||
| remove(result); | ||
| return result; | ||
| } | ||
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| @Override | ||
| public void clear() { | ||
| contents.clear(); | ||
| } | ||
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| private static class WeakIterator<T> implements Iterator<T> { | ||
| private final Iterator<WeakReference<T>> iterator; | ||
| private T next; | ||
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| private WeakIterator(Iterator<WeakReference<T>> iterator) { | ||
| this.iterator = iterator; | ||
| } | ||
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| @Override | ||
| public boolean hasNext() { | ||
| if (next != null) return true; | ||
| while (iterator.hasNext()) { | ||
| T t = iterator.next().get(); | ||
| if (t != null) { | ||
| //to ensure next() can't throw after hasNext() returned true, we need to dereference this | ||
| next = t; | ||
| return true; | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
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| @Override | ||
| public T next() { | ||
| T result = next; | ||
| next = null; | ||
| while (result == null) { | ||
| result = iterator.next().get(); | ||
| } | ||
| return result; | ||
| } | ||
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| @Override | ||
| public void remove() { | ||
| iterator.remove(); | ||
| } | ||
| } | ||
| } |